Lubricating oil pump structure suitable for lubricating oil system of lift fan of short vertical take-off and landing engine

Abstract

The invention belongs to the field of aero-engines, and discloses a lubricating oil pump structure suitable for a lubricating oil system of a lift fan of a short vertical take-off and landing engine, the lubricating oil pump structure comprises a shell assembly of a pump, the interior of the shell assembly is divided into a booster cavity and a working cavity, and the shell assembly is provided with a booster oil inlet, a booster oil outlet and a lubricating oil return port of the pump; lubricating oil enters the pressurizing cavity from the pressurizing oil inlet of the shell assembly and is discharged from the pressurizing oil outlet after being pressurized in the pressurizing cavity. The working cavity is communicated with the outside through a lubricating oil return opening; a bypass oil way is arranged between the pressurization oil outlet and the lubricating oil return opening. By arranging the bypass oil way, the flow of the booster stage outlet is guided to the oil return stage inlet, and self-lubrication of the oil return stage of the lubricating oil pump is achieved. According to the invention, the flowing direction of the lubricating oil introduced into the oil return stage inlet is controlled through the compression screw, so that the lubricating oil can smoothly flow into the oil return stage. The flow of lubricating oil introduced into an inlet of the oil return stage is controlled through the throttling nozzle, and insufficient flow of the booster stage caused by lubricating the oil return stage is prevented.

Description

Technical Field

[0001] The invention belongs to the field of aviation engines and relates to an aviation lubricating oil pump, and in particular to a lubricating oil pump structure suitable for a lift fan lubricating oil system of a short vertical take-off and landing engine. Background Art

[0002] Fixed-wing aircraft usually need a long runway during takeoff. Once a war breaks out, the enemy is likely to attack the runway of the military base first, making it impossible for the fighter to take off. Therefore, many countries are committed to researching vertical take-off and landing fighters. Using vertical take-off and landing technology, amphibious ships, aircraft carriers and other ships can carry more aircraft, thereby enhancing the ability to control the sea and air space. As a core component in vertical take-off and landing technology, the lift fan engine has a different working state from ordinary engines: when the aircraft is in the vertical take-off and landing state, the counter-rotating gearbox and clutch work normally, and the lubricating oil pump is required to transport and extract lubricating oil for lubrication and cooling of components. When the aircraft is flying normally, most of the lubricating oil in the clutch and counter-rotating gearbox flows to other places and is not pumped back to the oil tank by the lubricating oil pump. At this time, the lubricating oil pump only needs to pump the lubricating oil out of the oil tank, and does not need to pump the lubricating oil of the clutch and counter-rotating gearbox back to the oil tank. At this time, the lubricating oil pump works normally, but there is no oil in the return oil stage, which is easy to cause dry friction between the rotor and the partition.

[0003] According to the traditional lubricating oil pump design method, each level of oil return pump corresponds to an oil return stage inlet, and there is no separate lubrication structure between the oil return stage rotor and the partition, which leads to the phenomenon of dry grinding of the lubricating oil pump when there is no oil in the oil return stage but the lubricating oil pump is still working for a long time. The lubricating oil pump installed in the lubricating oil system of the short vertical take-off and landing lift fan has no oil in the oil return stage for a long period of time. The product obtained by the traditional lubricating oil pump design cannot meet the requirements of the lubricating oil system. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a lubricating oil pump structure suitable for the lubricating oil system of the lift fan of a short vertical take-off and landing engine, which can meet the special working conditions of the engine, namely, the working conditions where some return oil stages of the lubricating oil pump have no lubricating oil to pump and can only pump air.

[0005] The technical solution of the present invention is as follows:

[0006] A lubricating oil pump structure suitable for the lubricating oil system of a lift fan of a short vertical take-off and landing engine comprises a pump housing assembly, wherein the interior of the housing assembly is divided into a boost chamber and a working chamber, and the housing assembly is provided with a boost oil inlet, a boost oil outlet and a lubricating oil return port of the pump; the lubricating oil enters the boost chamber from the boost oil inlet of the housing assembly, and is discharged from the boost oil outlet after being pressurized in the boost chamber; the working chamber is connected to the outside through the lubricating oil return port; wherein a bypass oil circuit is provided between the boost oil outlet and the lubricating oil return port.

[0007] Furthermore, a throttle nozzle is provided between the bypass oil passage and the lubricating oil return port.

[0008] Furthermore, it includes a clamping screw component, a vertical oil passage is provided on the side of the bypass oil passage and is connected to the lubricating oil return port, a threaded circular hole is provided on the outside of the vertical oil passage position of the bypass oil passage, and the clamping screw component is inserted into the bypass oil passage through the threaded circular hole; a throttle nozzle is installed at the bottom of the clamping screw component.

[0009] Furthermore, the throttle nozzle is detachably connected to the clamping screw component, and the throttle nozzle can be replaced by models with different throttling sizes.

[0010] Furthermore, the pump is a cycloid pump, the bypass oil path is parallel to the axial direction of the cycloid pump, and the bypass oil path is connected to the lubricating oil return port of each stage of the cycloid pump at a position corresponding to each stage of the cycloid pump.

[0011] Furthermore, according to actual working conditions, the requirements of different oil return levels can be met by replacing the throttle nozzles at the bottom of different clamping screw components.

[0012] Furthermore, the bypass oil passage is arranged perpendicular to the boost oil outlet.

[0013] Furthermore, a maintenance pipeline is provided at the other end of the boost oil outlet relative to the bypass oil circuit, and a threaded sealing block is provided outside the maintenance pipeline.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The present invention provides a bypass oil circuit to guide the outlet flow of the boost stage to the inlet of the oil return stage, thereby realizing self-lubrication of the oil return stage of the lubricating oil pump.

[0016] 2. The present invention controls the flow direction of the lubricating oil introduced into the oil return stage inlet by tightening the screw, so that the lubricating oil can flow smoothly into the oil return stage.

[0017] 3. The present invention controls the flow rate of the lubricating oil introduced into the return oil stage through the throttle nozzle, thereby preventing insufficient flow rate of the boost stage due to lubrication of the return oil stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 The present invention is an assembly diagram of a lubricating oil pump suitable for a lift fan lubricating oil system of a short vertical take-off and landing engine according to an embodiment of the present invention.

[0020] Among them, 100 is the pump shaft component, 200 is the housing component, 300 to 700 are the clamping screw components in different positions, and 800 is the throttle nozzle. DETAILED DESCRIPTION

[0021] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the orientations or positional relationships in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or case referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection or an integrated connection; it can be a mechanical connection or a point connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0024] Embodiment 1:

[0025] A lubricating oil pump structure suitable for the lubricating oil system of a lift fan of a short vertical take-off and landing engine includes a pump housing assembly 200. The interior of the housing assembly 200 is divided into a boost chamber and a working chamber. The housing assembly 200 is provided with a boost oil inlet, a boost oil outlet and a lubricating oil return port of the pump; the lubricating oil enters the boost chamber from the boost oil inlet of the housing assembly 200, and is discharged from the boost oil outlet after being pressurized in the boost chamber; the working chamber is connected to the outside through the lubricating oil return port; wherein a bypass oil circuit is provided between the boost oil outlet and the lubricating oil return port.

[0026] A throttle nozzle 800 is provided between the bypass oil passage and the lubricating oil return port.

[0027] It includes a clamping screw component. A vertical oil channel is provided on the side of the bypass oil channel and is connected to the lubricating oil return port. A threaded circular hole is provided on the outside of the vertical oil channel position of the bypass oil channel. The clamping screw component is inserted into the bypass oil channel through the threaded circular hole. A throttle nozzle 800 is installed at the bottom of the clamping screw component.

[0028] The throttle nozzle 800 is detachably connected to the clamping screw component, and the throttle nozzle 800 can be replaced by models with different throttling sizes.

[0029] The pump is a cycloid pump, the bypass oil passage is parallel to the axial direction of the cycloid pump, and the bypass oil passage is connected with the lubricating oil return port of each stage of the cycloid pump at a position corresponding to each stage of the cycloid pump.

[0030] According to actual working conditions, the requirements of different oil return levels can be met by replacing the throttle nozzle 800 at the bottom of different clamping screw components.

[0031] The bypass oil passage is arranged perpendicular to the boost oil outlet.

[0032] An inspection pipeline is arranged at the other end of the boost oil outlet relative to the bypass oil circuit, and a threaded sealing block is arranged outside the inspection pipeline.

[0033] Embodiment 2:

[0034] like Figure 1 The invention is an assembly diagram of a lubricating oil pump suitable for a lift fan lubricating oil system of a short vertical take-off and landing engine according to an embodiment, comprising a pump shaft component 100, a housing component 200, a clamping screw component (300, 400, 500, 600, 700), and a throttle nozzle 800.

[0035] The pump shaft component 100 rotates to transmit torque to make the boosting stage of the lubricating oil pump work. When the lubricating oil is discharged from the boosting stage outlet, part of the lubricating oil is pressed into the oil return stage through the bypass oil path connecting the boosting stage outlet and each oil return stage due to the pressure difference between the boosting stage outlet pressure and the oil return stage inlet pressure on the shell component 200, thereby playing a role in lubricating the oil return stage rotor.

[0036] A clamping screw component (300, 400, 500, 600, 700) is provided at the outlet of the bypass pipeline. The clamping screw component (300, 400, 500, 600, 700) is detachable and easy to disassemble and assemble. By replacing a throttle nozzle 800 installed inside the clamping screw component, the throttle nozzle 800 plays the following roles:

[0037] The lubrication flow from the supercharging stage to the oil return stage can be adjusted according to the actual situation to meet the requirements of the lubrication oil return stage under different working conditions. For example, when the engine is in a certain operating condition, there is a small amount of oil return in the oil return stages V and VI, but it still cannot meet the flow requirements for lubricating the rotor. At this time, the lubrication flow required for the oil return stages V and VI is lower than that of other oil return stages. In order to avoid excessive lubricating oil from the supercharging stage to the oil return stages V and VI, which exceeds the flow requirements for lubricating the rotor, the throttle nozzle 800 can be replaced, and the through-hole diameter of the throttle nozzle 800 can be changed according to the law of conservation of mass and the Bernoulli equation, thereby controlling the flow to the oil return stages V and VI.

[0038] The invention guides the outlet flow of the boosting stage to the inlet of the oil return stage through a bypass oil circuit, thereby realizing self-lubrication of the oil return stage of the lubricating oil pump.

[0039] By tightening the screw, the flow direction of the lubricating oil introduced into the oil return stage is controlled so that the lubricating oil can flow smoothly into the oil return stage.

[0040] The flow rate of the lubricating oil introduced into the return oil stage is controlled by the throttle nozzle to prevent insufficient flow rate of the boost stage due to lubrication of the return oil stage.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A lubricating oil pump structure suitable for a lift fan lubricating oil system of a short vertical take-off and landing engine, characterized in that: The invention comprises a housing component (200) of a pump, wherein the interior of the housing component (200) is divided into a boost chamber and a working chamber, and the housing component (200) is provided with a boost oil inlet, a boost oil outlet and a lubricating oil return port of the pump; the lubricating oil enters the boost chamber from the boost oil inlet of the housing component (200), and is discharged from the boost oil outlet after being pressurized in the boost chamber; the working chamber is connected to the outside through the lubricating oil return port; wherein a bypass oil circuit is provided between the boost oil outlet and the lubricating oil return port.

2. The lubricating oil pump structure suitable for the lubricating oil system of the lift fan of a short vertical take-off and landing engine according to claim 1, characterized in that: A throttle nozzle (800) is provided between the bypass oil passage and the lubricating oil return port.

3. The lubricating oil pump structure suitable for the lubricating oil system of the lift fan of a short vertical take-off and landing engine according to claim 2, characterized in that: The invention comprises a clamping screw component, a vertical oil channel connected to the lubricating oil return port is arranged on the side of the bypass oil channel, a threaded circular hole is arranged outside the vertical oil channel position of the bypass oil channel, and the clamping screw component is inserted into the bypass oil channel through the threaded circular hole; a throttle nozzle (800) is installed at the bottom of the clamping screw component.

4. The lubricating oil pump structure suitable for the lubricating oil system of the lift fan of a short vertical take-off and landing engine according to claim 3, characterized in that: The throttle nozzle (800) is detachably connected to the clamping screw component, and the throttle nozzle (800) can be replaced by models with different throttling sizes.

5. The lubricating oil pump structure suitable for the lubricating oil system of the lift fan of a short vertical take-off and landing engine according to claim 1, characterized in that: The pump is a cycloid pump, the bypass oil passage is parallel to the axial direction of the cycloid pump, and the bypass oil passage is connected with the lubricating oil return port of each stage of the cycloid pump at a position corresponding to each stage of the cycloid pump.

6. The lubricating oil pump structure suitable for the lubricating oil system of the lift fan of a short vertical take-off and landing engine according to claim 5, characterized in that: According to actual working conditions, the requirements of different oil return levels can be met by replacing the throttle nozzles (800) at the bottom of different clamping screw components.

7. The lubricating oil pump structure suitable for the lubricating oil system of the lift fan of a short vertical take-off and landing engine according to claim 1, characterized in that: The bypass oil passage is arranged perpendicular to the boost oil outlet.

8. The lubricating oil pump structure suitable for the lubricating oil system of the lift fan of a short vertical take-off and landing engine according to claim 7, characterized in that: An inspection pipeline is arranged at the other end of the boost oil outlet relative to the bypass oil circuit, and a threaded sealing block is arranged outside the inspection pipeline.

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